updated to 1009 BIOS. Memory configuration: 64GB RAM: 8GB x 8 (Mushkin 1333 MHz, 1.5 V, Part No. 994018).
Updated the p9x79 (deluxe) BIOS today to the latest (3/27/2012) release, 1009 BIOS. Updated ok, but reboot failed (did not get to splash screen or any screen). I noticed the DRAM led light on and code 69 on the motherboard. I hit the memok! button, and then reboot succeeded. However, the BIOS screen shows "ABNORMAL!" for dimm_d1 (and dimm_d1 only). I'm suspicious because that error did not show with the previous BIOS and because my own memory tests show everything is ok. I tried reseating the D1 dimm, but I get the same error.
Question 1: Is it possible that something in the new BIOS triggers a spurious error, and should I change the dram timing section from the default to correct it (or should I change any other bios setting)?
Question 2: I show 60GB of memory in memory testing now and in windows, I think that was 64GB before. The bios boot screen shows 61440MB now--I would have expected 65536 MB of course (8192x8). Is the motherboard sealing off access to 4 GB (half of a dimm)? It seems like it could be some sort of programming error.